/*
 * Copyright (C) 2018 The Sylph Authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package ideal.sylph.runner.flink.udf;

import ideal.sylph.annotation.Description;
import ideal.sylph.annotation.Name;
import org.apache.flink.api.common.typeinfo.TypeInformation;
import org.apache.flink.api.common.typeinfo.Types;
import org.apache.flink.table.functions.ScalarFunction;

import java.sql.Timestamp;

public class TimeUtil
{
    @Name("from_unixtime")
    @Description("from_unixtime(long)-> TIMESTAMP")
    public static class FromUnixTime
            extends ScalarFunction
    {
        @Override
        public TypeInformation<?> getResultType(Class<?>[] signature)
        {
            return Types.SQL_TIMESTAMP;
        }

        public Timestamp eval(long time)
        {
            return new Timestamp(time);
        }
    }
}
